Educational device.



J. DAVIS.

EDUCATIONAL DEVICE.

APPLICATION FILED SEPT. 10, 1908.

27 49, Patented July 13, 1909.

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device, primarily adapted for use in the JESSIE DAVIS, OF CHICAGO,ILLINOIS.

EDUCATIONAL DEVICE Specification of Letters Patent.

Patented July 13, 190's.

Application filed September 10, 1908 Serial No. 452,356.

To all whom it'ma'y concern:

Be it known that I, J ESSIE DAVIS, a citizen I of the UnitedStates,residing at Chicago,

" ing.

in the county of Cook and State of Illinois, have invented certain newand useful Improvements in Educational Devices, of which the followingis a specification, reference being had therein to the accompanyingdraw- This invention relates to an educational kindergarten and primaryschools and having as its object the stimulation and development of thecreative activity of children.

With this object in view, the invention has reference to the occupationwork of the pupil, or the art of construction, whereby the child can, inits own way, appreciate the constructive work of mankind.

Further, the invention deals with the different, modes of arranging andgrou ing plane surfaces relative to each other an includes a pluralityof planes having an interlocking connection one with the other.

More particularly, the invention consists in the formation of aplurality of planes detachably intersected with and by each other byslit-ting each plane from its outer edge or periphery as the case may beto a point adjacent the center, and sliding the planes together with theslitted portion of each plane straddling or overlapping the solidportion of the intersecting plane projecting beyond the slit.

Other details in construction and arrangement will be pointed out in thedescription following, reference being especially directed in connectiontherewith to the accompanying drawings, which form a part hereof.

In the drawings, is shown, for the purpose of illustration, a convenientembodiment of the invention, and Figure 1 is'a plan view of each of theparts oing to make up three intersecting planes, t e several parts beingdetached for'the purpose of clearness, Fig. 2 is a perspective viewshowing two of the parts assembled to form two intersecting planes, Fig.3 is a similar view showing three of the parts assembled, Fig. 4 is asimilar view disclosing all of the parts assembled to constitute threeintersecting planes,

and Fig. 5 is a view disclosing the three intersecting planes in foldedor collapsed condition.

The same letters designatecorresppnding parts in the several views ofthe drawings, A

being one plane and constituting the body or foundation tobe built upfrom. This plane I shall designate the first plane, the same be- 1ngconven1 ently of circular formation, and having a sl1t A extending fromthe periphery thereof to its center, oppositely disposed slits A beingformed at rlght angles to the first mentioned slit and extending fromthe 'perlphery to a point midway of a line drawn from the periphery tothe center of the plane. B 18 a second plane, likewise conveni entlyformed circular inoutline, and having a slit B extending from itsperiphery to its center. The planes A and B are thus assembled bysliding one over the other at right angles, the slit B of the plane Bstraddling the solid portion of the plane A that 0 pro ects beyond the'slit A thereof. Two intersecting planes are thereby formed. C,'ldesignates similarly formed members, semi-circu provided with slits c,d, respectively, extending from the center of the straight edge to apoint midway of a line drawn at right angles from the straight edge tothe periphery ofthe curved portion. As thus 'constructed, the parts Cand D are arran ed to slide over the first plane A, the slitted portions0 and d engaging the solid portions of said'plane A extending beyond theslits c and d. When seated, these member 0 and D engage oppositesurfaces of the second plane ar in configuration, and each are B, andconstitute in effect continuations one of the other whereby is formedthe third intersecting plane.

Each of the parts going to make up the plane is preferably flexible inconstruction, conveniently a heavy paper, sufficiently flexible to foldeasily, yet stiff enough to retain its shape. As thus constructed, theparts are collapsible after the manner shown in Fig. 5, presenting the.appearance of a series of superimposed layers. In this way, the devicemay be packed and shipped from school to school, or the child can foldand take home, there to open or reconstruct it and show the result ofhis days occupation.

It will be appreciated that the child, through play with theintersecting planes, not only learns how to intersect, but the formssuggest to him some of the things he can afterward make, as troughs,cradles, chairs etc., and all this without direct teaching, whereby thelearning is developed and knowledge retained much longer and to bettr-radvantage than were it forced upon him by instruction. By simply playingwith the device, the child soon learns to measure, he will gain skill ofhand through cutting, his inventive power in fastening planes togetheris drwcloped, and he learns how things about him are made. In otherwords, he gains an uuderstaluling of the work of man.

I claim:

1. An educational device of the character described, comprising anlurality of circular planes intersected by and with each other,

the planes having cooperating slitted portions, the slitted portion teach plane --lradd'ling the solid portion of the intersecting plane thatprojects beyond the slit.

2. ..\n educational device of the character described comprising aplurality of planesof like configuration adapted to be intersected byand with eat-h other, each plane having a slit-ted portion extendingfrom the outer edge to the center, the slitted portion of each planestraddling the solid portion of the intersecting plane that projectsbeyond the slit, one of said planes having auxiliary oppositely disposedslitted portions, and two parts formed after the fashion of one-half ofone of the aforementioned planes, said parts having slitted portionscooperating with said auxiliary oppositely disposed slitted portions onsaid. first mentioned planes, whereby when assembled the said parts willconstitute a third plane intersecting by and with the first mentionedplanes.

3. An educational device of the character described comprising aplurality of parts each having a slitted portion whereby they may bedetachably interlocked to form three similar planes intersected by andwith, each other.

4. An educational device of the character described comprising aplurality of planes of like configuration which are intersected by andwith each other through the medium of cooperating longitudinal slits ineach, said planes being constructed and arranged to collapse and offerno protuberance beyond the outer edge of one another when collapsedwhile maintaining the interlocking condition.

5. An educational device of the character described comprising aplurality of planes adapted to be intersected by and with each other,each plane having a slitted portion extending from the outer edge to apoint adjacent the center, the slitted portion of each plane straddlingthe solid portion of the intersecting plane that projects beyond theslit, and one of said planes having an auxiliary slitted portionextending at an angle to the first mentioned slit therein and terininating short of the center, and a part having a slit cooperating withsaid auxiliary slit whereby the latter slitted portion straddles thesolid portion of the intersecting plane that projects beyond the slit.

(3. An educational device of the character described comprising acircular plane having a slit extending from the outer edge to thecenter, an auxiliary circular plane having, a slit extending from theouter edge to the center, the slitted portion of each plane straddlingthe solid portion of the inter sect-ing plane that projects beyond theslit, the auxiliary plane also having oppositely disposedslit-tedportions extending from the outer edge of the plane to a point short ofthe center and at right angles to the first mentioned slit, and twosemicircular parts each having slitted portions corresponding with thesaid oppositely disposed slitted portions of the auxiliary plane,whereby when assembled the said parts will constitute a third circularplane intersecting by and with the first mentioned planes.

7 In testimony whereof I afiix my signature in presence of twowitnesses.

. JESSIE DAVIS.

Witnesses E. D. NEAL, J. N. Cnonsn.

